You train the older ones to watch the younger ones.
Though that leads to consequences one sometimes doesn't anticipate.
Such as: coming home from dinner one evening in the mid-1980s to discover that the older ones had used her Boomalinks (colorful plastic links that can be used to make chains in various patterns) to carefully fasten their 18-month-old sister to the coffee table with Layne Staley singing in the background for a tableau vivant called "Alice In Chains". Alice was fine, smiling away, the center of attention with a bowl of Cheerios. Stern words to the high schooler who had been in charge; Boomalinks hidden when adults departed the house.
